<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>MZT</title>
    <meta name="viewport">
    <style>
<!--        元素选择器-->
        h1{
            text-align: center;
            color: green;
            background-color: lightblue;
        }
        /*ID选择器*/
        #test1{
            color: purple;
        }
        /*类选择器*/
        .red{
            color: blue;
            font-size: 2em;
            text-align: center;
        }
        .mzt{
            color: #9df180;
            text-align: center;
        }
        .mzt_pur{
            text-align: center;
            color: black;
        }


    </style>

</head>
<body>



</body>
</html>